Comparison between reflux episodes with and without PSPW The magnitude of the pH drop was larger and the nadir pH was lower in the reflux episodes with PSPW compared to without PSPW, but these did not reach statistical significance (Fig. 2 ).
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Post-reflux swallow-induced peristaltic wave (PSPW): physiology, triggering factors and role in reflux clearance in healthy subjects.
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